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Achieve elevated thermal stability with ASME SA240 ASTM A240 UNS S34809 stainless steel sheet, a high-carbon, Nb-stabilized austenitic variant for demanding elevated-temperature service. As Gangsteel, your trusted supplier, manufacturer, and exporter, we produce this robust grade in precision Chinese mills, meticulously conforming to ASME and ASTM standards for international thermal and pressure applications. UNS S34809, the "H" iteration of 348, incorporates higher carbon for creep strength while capping cobalt for low activation, making it vital for furnace tubing, superheaters, and expansion bellows in power plants and petrochemical refineries. Our ASME SA240 ASTM A240 UNS S34809 stainless steel sheets fortify your high-heat infrastructure with proven endurance.
Backed by Gangsteel's ISO 9001 and PED validations, we streamline global procurement. Deploy our sa240/a240 uns s34809 seamlessly—connect for competitive quotes and efficient turnaround. Comparable high-carbon allies: sa240/a240 uns s34800, sa240/a240 uns s35045, or sa240/a240 uns s35135.
Gangsteel Comprehensive Guide to ASME SA240 ASTM A240 UNS S34809 stainless steel sheets, a high-carbon, Nb-stabilized austenitic grade for enhanced creep resistance at elevated temperatures. Covering chemical composition, mechanical properties, international equivalents, specifications, applications, advantages, and pricing from Gangsteel, it highlights why this material is ideal for furnace components, superheaters, and high-temperature pressure vessels. With detailed tables and FAQs, discover how Gangsteel's expertise ensures quality and global delivery.
ASME SA240 ASTM A240 UNS S34809 stainless steel sheetis a hot-rolled or cold-rolled plate from the austenitic family, engineered with higher carbon and columbium (niobium) stabilization for superior high-temperature strength and resistance to sensitization. Specified under ASME SA240 for pressure vessels and ASTM A240 for general corrosion applications, it's supplied in annealed condition for wrought forms like sheets and plates. The "09" denotes its high-carbon profile (0.04-0.10%), boosting creep rupture properties, while low cobalt (≤0.20%) suits nuclear-adjacent uses.
Superior to 304/316 in sustained heat up to 870°C, UNS S34809 stainless steel sheets resist intergranular corrosion post-welding via Nb binding, with solid oxidation scaling. Density: 8.0 g/cm³ for practical fabrication into boiler tubes, reformer coils, and ducting. Gangsteel dispatches volumes globally with ISO 9001/PED assurance. Related: sa240/a240 uns s35315 or sa240/a240 uns s38100.
ASME SA240 ASTM A240 UNS S34809 stainless steel sheet's mix optimizes thermal endurance. Per ASTM A240/SA240:
|
Element |
Composition Range (%) |
Role in Alloy |
|---|---|---|
|
Carbon (C) |
0.040-0.100 |
Elevates high-temp strength/creep |
|
Manganese (Mn) |
≤2.000 |
Boosts hot ductility |
|
Phosphorus (P) |
≤0.045 |
Controls embrittlement |
|
Sulfur (S) |
≤0.030 |
Mitigates hot tearing |
|
Silicon (Si) |
≤1.000 |
Supports scaling resistance |
|
Chromium (Cr) |
17.00-19.00 |
Shields against oxidation |
|
Nickel (Ni) |
9.00-13.00 |
Maintains austenite at heat |
|
Niobium (Nb) + Tantalum (Ta) |
10xC min - 1.100 max |
Ties carbides to avert sensitization |
|
Cobalt (Co) |
≤0.200 |
Limits activation in radiation |
|
Nitrogen (N) |
≤0.100 |
Subtle hardening |
|
Iron (Fe) |
Balance |
Core framework |
Tailors UNS S34809 stainless steel sheets for creep. Gangsteel's PMI authenticates. Akin: sa240/a240 uns s38815 or sa240/a240 uns s31200.
ASME SA240 ASTM A240 UNS S34809 stainless steel sheetsfurnish annealed prowess:
|
Property |
Value (Minimum) |
Test Condition |
|---|---|---|
|
Tensile Strength |
515 MPa (75 ksi) |
Annealed |
|
Yield Strength |
205 MPa (30 ksi) |
0.2% Offset |
|
Elongation |
40% in 50mm |
Transverse |
|
Hardness |
≤201 HB (Brinell) |
Annealed |
Annealed/pickled; temper variants. ASME SA240 vessels; ASTM A240 fittings. Gangsteel's tailoring. Kin: sa240/a240 uns s31260 or sa240/a240 uns s32001.
Gangsteel's worldwide parallels:
|
Country/Region |
Designation |
Standards |
Key Notes |
|---|---|---|---|
|
USA |
UNS S34809 / AISI 348H |
ASTM A240, ASME SA240 |
High-C 348 variant |
|
Europe |
1.4912 |
EN 10088 |
Nb-stabilized high-temp |
|
Germany |
X10CrNiNb18-9 |
DIN 17460 |
Creep-resistant |
|
Japan |
SUS 348H (equiv.) |
JIS G 4303 |
Elevated C for strength |
|
China |
0Cr18Ni11NbH (equiv.) |
GB/T 1220 |
High-C stabilized |
Converge on heat. Info: sa240/a240 uns s32003 or sa240/a240 uns s32101.
Gangsteel's ASME SA240 ASTM A240 UNS S34809 stainless steel sheets:
|
Specification |
Range/Details |
|---|---|
|
Thickness |
0.5 mm to 200 mm |
|
Width |
Up to 4500 mm |
|
Length |
Up to 12000 mm |
|
Surface Finish |
Hot-rolled (No.1), Cold-rolled (2B, BA), Annealed & Pickled |
|
Forms |
Sheets, Plates, Strips, Coils, Cut-to-Size |
|
Cutting Options |
Plasma, Laser, Waterjet |
Density: 8.0 g/cm³. Bespoke for sa240/a240 uns s32900.
UNS S34809 stainless steel sheetsfor thermal rigor:
Gangsteel's extend runtime 20%. Pair: sa240/a240 uns s32906.
Gangsteel's ASME SA240 ASTM A240 UNS S34809 stainless steel sheets:
Premier aid. More: sa240/a240 uns s32950.
ASME SA240 ASTM A240 UNS S34809 stainless steel sheetsleverage 0.04-0.10% C for creep at 870°C, Nb (10xC-1.1%) blocks sensitization. Low Co curbs activation. Outpaces 347H in sustained oxidation. NACE ratifies.
Gangsteel's readies. Vs. sa240/a240 uns s32803.
Gangsteel's UNS S34809 pricing (Reference value, due to fluctuations in raw materials and market, the specific price shall prevail):
1 ton min; 15% bulk. admin@gangsteel.com. https://gangsteel.net. Cf. sa240/a240 uns s31200.
UNS S34809(Type 348H) is a high-carbon, Nb-stabilized austenitic stainless steel for elevated-temperature applications like superheater tubes in boilers, reformer coils in petrochemical crackers, and radiant tubes in heat-treating furnaces, where creep strength up to 870°C and sensitization resistance are crucial. The higher C (0.04-0.10%) enhances rupture life vs. standard 348, while low Co (≤0.20%) suits semi-nuclear uses. Gangsteel provides ASME/ASTM sheets for pressure vessels and piping, with deployment in steam generators cutting creep failures 25%. For lower heat, see sa240/a240 uns s31260.
UNS S34809parallels 347H (S34709) in Nb stabilization and Cr/Ni (17-19%/9-13%) but limits Co to 0.20% max for reduced neutron activation, with matched high C (0.04-0.10%) for creep at 800°C+ (UTS 515 MPa both). 347H allows higher Co (~1%), suiting non-radiation; S34809 prioritizes purity for power/nuclear-adjacent, with 15% better weld stability per ASTM A262. Cost: S34809 8-12% more for Co control. Gangsteel qualifies S34809 per ASME NCA for vessels. Equiv: sa240/a240 uns s32001.
Yes, UNS S34809 welds effectively like 347H using GTAW/SMAW with ER347H fillers; Nb (8xC-1.0%) sequesters carbides, negating PWHT for thicknesses <13mm, though 1050-1120°C anneal optimizes for thick (>25mm). Preheat 150°C, interpass <250°C to manage C-induced cracking. ASTM A262 Practice A/E verifies no IGA after 1000-hour Huey test. Gangsteel furnishes WPS/PQR certs for code welds, enabling multi-layer fabrication with 5% less distortion than unstabilized. Protocols: sa240/a240 uns s32003.
ASME SA240 ASTM A240 UNS S34809 stainless steel sheetdensity: 8.0 g/cm³ (0.289 lb/in³), consistent with 300-series, supporting lightweight high-temp structures like boiler panels without creep compromise. Reduces transport costs 10% vs. denser alloys. Gangsteel models for efficiency.
Gangsteel: ~$2.15-$3.05/kg standard (FOB), per high C/Nb; plate/custom +10%. 1+ ton: 15% discount. Market-driven; admin@gangsteel.com for precise. Vs. 347H: 5% uplift for low Co. Reference: sa240/a240 uns s32101.
UNS S34809solution anneals 1050-1150°C (quench) to redissolve carbides, leveraging Nb for stability—no stabilization needed, but stress-relieve 870-980°C (1 hr/inch) for welded/formed to curb distortion. Sidestep 425-870°C >2 hrs for sigma avoidance. Gangsteel certifies via ASTM A262 for 870°C creep, ensuring uniform grain for tubesheets. Cycles: sa240/a240 uns s32900.
Gangsteel's UNS S34809 sheets include EN 10204/3.1 MTCs (chem/tensile/creep), PMI/UT (A578 Lv2), third-party (SGS/BV) for ASME II/IX, ASTM A240, PED compliance. ISO 9001 traceability; optional ASME N-Stamp, low Co per EPRI, and high-temp quals like RT rupture. Supports nuclear-adjacent codes. Explore: sa240/a240 uns s32906.
Acquire robust ASME SA240 ASTM A240 UNS S34809 stainless steel sheet from Gangsteel. https://gangsteel.net or admin@gangsteel.com for samples/MTCs/quotes. Shanghai/Rotterdam for rapid global—excel with Gangsteel! View sa240/a240 uns s32950.
Keywords: ASME SA240 UNS S34809, Type 348H stainless steel sheet, Gangsteel supplier
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